Definitely an affordable price for most folks, and if they work out for you then you've got yourself a great boot at a great price.
Just a few questions you should be asking the retailer before you buy:
-What's the warranty on the boots, if any?
-What's their return/exchange policy if the boots don't fit? -buying boots online can be a bit tricky in terms of sizing
-What's their return/exchange policy if when you receive the boots, you're not happy with their initial quality? (i.e. just examining them straight out of the box) and want to return them (provided they're in new and unused condition)
Most reputable retailers will exchange boot sizes for you provided that the boots you return are still in new and unused condition. Just be sure to wear the boots around your house for some time to ensure that they fit right. That way they'll stay clean and not get scuffed/scratched in case you need to return them.
Good luck with your search and eventual purchase.
Cheers,
Matt