Yeah, that is a really good price for 4 tires on wheels but the Gecko's are about the WORST sand tire you can buy. Those single-rib fronts aren't great either. I had that style on my V at first but it pushed pretty badly in turns. I changed over to the Sand Star dual-ribs and they were a night-and-day difference.
For $100 it would be worth buying them for the wheels and put all those crap tires back on craigslist or eBay for sale by themselves.