i have purchased little things from ebay for growing with no problems
the bigger stuff like lights and tents is very expensive to ship so i don't buy them from flea bay i get them from local stores
get them to give you a price for shipping before purchase
pay pal is a good way to buy things they cover you if you get ripped off,
i have had good luck so far with flea bay
always check there feed back and some nutes are not aloud to cross the border (us to canada)mainly orgranic nutes