Mike, Never heard of an Allmand. Terramites are sold mostly to DIY rent a centers. Mine came used, 4 years old and 435 hours, form a rent a center.
The main reason I went with Terramite is that's it's gas powered. I can't stand to be within 300 feet of a desiel without getting a throbbing headache.
Terramite, to my knowledge, has no dealers. You deal directly with them. I call an 800# to get parts. Very simple to work on, so far.
Mine's a 2004 with about 1500 hours. I could sell it today for about what I paid for it. Have way too much fun and get a lot done with it to ever think of selling.