The purchase price of cassettes indicated by users allows you to obtain a reference point in the market, since sellers can set any price that does not reflect the real value of the cassette.
The table displays the average value of all prices specified by users.
In the future, this will allow everyone to get an assessment of their collection, with the caveat that all prices are conditional and highly depend on the time of purchase, each country and other factors.
Please take this as advice and assistance, not as a rule or instruction.

Detailed descriptions of each condition are used in the table, but for greater convenience and simplicity we have removed Excellent or Very Good Plus.

Mint - These are the sealed/unopened cassette tapes. No visible damage on the cellophane wrap.

Near mint (NM or M-) 100% perfect. No issues with the inlay, label, casing, reels, media, shell, tape head opening, pressure pad, tape guide and capstan & pinch roller openings.These are tapes that look, feel and sound like the cellophane wrap just came off the first time. Some may even have the cellophane wrap but with visible signs of distress. Cassette tapes that are NM should have no visible defects. The tape media should be near-perfect, with no visible marks of scuffs and folds. The inlay and label are near-perfect, with no hind of writing, tear or peeling. When played, the audio quality should be as good as when it was new. The tape mechanisms are also nearly perfect. 

Excellent or Very Good Plus (E or VG+) - These cassette tapes show signs of use, including very light scuffs or scratches on the casing or the shell. The inlay shows signs of being pulled out, unfolded then put back in. The labels are show signs of fade. The metal on the pressure pad shows a tad hint of rust bud the pad itself remains near-pristine. The media of the tape has zero signs of fold or scruff marks. When played, there are no audible signs of dropouts and nearly zero loss in fidelity. Practically zero distortion.

Very Good -The cassette tape may show signs of frequent use. The folds on the inlay may show signs of near tear/split but are not torn nor split. Could also have visible signs of fade. Labels may have writings but has no signs of being peeled and could have visible signs of fade. The casing may have visible fracture lines but no breaks. The two parts of the casing do not fall off nor split. The shell has visible scuffs and marks. No squeaks coming from the feed and take-up reels. The media of the tape has no folds or scruff marks. The metal on the pressure pad may have minor rust spots but the pad itself is intact. When played, there may be an slight audible sign of loss in fidelity but no dropouts. Practically zero distortion.

Good - The cassette tape show clear visible signs of frequent use. The folds of the inlay may be torn but not fully and shows clear signs of fading. Labels has writing and may show signs of an attempted peel. The casing has a crack but not broken. The two signs of the casing may fall off or split. The shell has clear scruffs and marks. The metal on the pressure pad has clear signs of rust but the pad itself is still in good condition. There are minor squeaks coming from the feed and take-up reels. The media of the tape may have signs of being folded or scuffed but does not affect play in general. When played, there could be a negligible audible loss in fidelity.

Poor - The cassette tape shows either clear signs of frequent use or clear signs of it is was not well taken care off: peeled labels, torn/split/missing inlay, broken casing. The shell of the tape has cracks or splits that may compromise the integrity of the media. The  metal of the pressure pad has rust, the pressure pad is damaged or the pressure pad is missing. There are very audible squeaks coming from the feed and take-up reels. The media of the tape has clear marks that it got folded or scuffed and is affecting the play. There are visible scruff marks on the tape media. When played, there is a significant loss fidelity, has drop-outs and/or has distortion. There are are clear, audible signs of a record-over.

Thanks for An Unofficial Guide to Grading Cassette Tapes compiled by the Plaka Express Record Store.