Is the price justified? Original G1 Dino cassettes and not the K.Os

I recently saw from an online Japanese store the following Cassettes
1. C-121
2. C-123
3. C-122
4. C-124
All are opened/used but without any Bio cards. Condition more or less in between fine to near mint at US S 500.00 each at the current exchange rate. Is the price fair?
1. C-121
2. C-123
3. C-122
4. C-124
All are opened/used but without any Bio cards. Condition more or less in between fine to near mint at US S 500.00 each at the current exchange rate. Is the price fair?