Never been to Hawaii, but 7.62x39 can be had a walmart here in MO. If you can get it shipped there at all, the 7.62x39 is probably going to be cheaper, at around $.08 per round here on the continent. 5.45x39 is a very flat shooting round, and very effective (unlike M855 5.56). Usually around $.10 per round. Magazines for either an AKM/AK-47 (.30cal) are either steel or polymer, and cheap, with 30rd steels usually around $8, and 30rd polymer $10-$15. The AK-74 (5.45) mags are all polymer or bakelite, you will want any bulgarian polymer model. They are usually about $11. As far as different variations are concerned, if you decide on a .30cal AK, go with the romanian sar-1. Check auctionarms.com, a fellow named Gerry Sweet usually has a few. If you want the smallbore, I would also recommend the SEAK, it is going to be a sweet rifle, and the cost, while being double of the sar-1, will be worth it. I have an sar-1 now, and I love the thing. It is accurate and reliable and it scares bolt gun guys at the range. It is not finished well, but thats ok. I put kvar black stocks on it, and plan to add a RSA trigger group. I am on the list for the SEAK as well, it will be a full custom built rifle, using a lot of Bulgarian parts. These are probably the best out there, short of russian parts. Once you get an AK, there is no going back, but I laugh at the die hard AR types. I will have two AK type rifles, both will be reliable as hell, and I will have them both for the cost of one high end AR. Ammo is much cheaper, mags are much cheaper, and they never ever jam. Bwahahaha!! Pro ak rant over.