This will probably end up in Props or Makeup, contacts seem to have never been easy to place. XD
Scelra lenses never come cheaper than that. 9mm SFX
doesn't charge extra for most prescriptions (barring torics and + or - 10.00 or greater). I couldn't find the shipping cost on the site you posted, but 9mm uses 2-3 Day shipping after it creates the lenses, and costs $20. I've had great experiences with 9mm SFX, and their scelra lenses can last some time with proper care. I know other contacts come at the same quality, but I've never dealt with FX Eyes before (though I have looked through their site) so I can't say for sure their quality, but they look pretty good.
Those seem like they would work. Just keep in mind that these are a major investment for a costume, and that sclera lenses aren't terribly comfortable. You also need a special prescription for sclera lenses because they cover your entire eye and have a different diameter and base curve than normal lenses. I've been getting regular contacts for years, now, getting my prescription updated each year, and I still needed to go in for a special exam to get the right prescription for a pair of sclera.