I found this guy at the thrift store today and the fact it had the head made me pick it up. Other than that and the body, he's pretty bare. At some stage the former owner slapped some G1 Prime stickers on it, and there's a small stress mark on part of the ladder. I'm not a G1 collector so I don't really know the value. Was hoping someone could help!
g1 hosehead | eBay The answer to the question "how much is X worth" is always "search ended ebay auctions"
You could try sending your pics to the guy who owns transformerland.com. I see his complete headmasters usually go for $120-ish, while just the vehicle goes for $30ish. I'm guessing what you have there might go for somewhere in the $80's.
Incomplete is not worth $80. Look around on eBay, that is the up to date current value of any collectable item that can be shipped.
if you just want it for your collection and don't plan on selling it, there is a guy on shapeways that sells the small "ear" guns and the rifle for a reasonable price.
It's a cool figure for sure...but I have to agree with the estimates of something near $30-$40. The head alone is likely worth more than the rest of the figure. I like the Shapeways suggestion above for the accessories. Also, Toyhax.com offers reproduction sticker sheets which may be a fun project. In any case, that's a great thrift store find.