That is probably a good price, depending on condition. If they are "new take outs" for a handicapped conversion, that is an excellant price.
My van is a 2001, and I noticed that the 96 to 2000 seats are somewhat bit cheaper, while shopping on eBay. I felt very lucky to get my 01 seats for ~$230 + $125 shipping, and mine were definitly used.
You should take a look on ebay, and make sure you look at auctions for seats that have actually sold. There are a lot of people who put up seats on ebay at sky high prices, over and over, until they sell. THis will give you more confidence.