It's just safer and more convenient to buy in country. Also stick with what works. MadBull nades are the best bang for your buck. those D-boys seem cheaper but after you add up all your taxes, shipping and customs/duties fees, you're looking at near enough the same cost for what I deem as an inferior piece. that's if it gets past customs and not blocked by our friendly cbsa. plus, airsoftparts has the maintenance kits readily available.
btw, IMO go CO2 or don't bother!