Markus is the only place which keeps updating weapons according to your level. rest of the machines get their weapon levels stuck at whatever level you found the machine at. but they are still worth checking. otherwise, check the quest spots for new weapon caches. there is always one near or on the way to every one of those square spots. these are my current fav weapons :3 i am an assasin class this was my first buy (and as u see, i went big). $72,000 the best weapon i had did only 1000damage. so this was awesome. Soon this came by in the DLC and so did this badass shotgun. Hunter's Grotto is a tough cookie. the other DLC was too easy.