I use the HK ones too. They work fine. But with the shipping and all.. See if your lhs has 40 dollar maverick carbon fibers. U might not have to wait for them to come in, for three weeks.
But it all depends on what you wanna spend.

what's your budget? 600 blades can go from 15-120 bucks.
If nothing else I would check eBay for those. eBay has some cheap glass fibre of carbon Fibres too.
