Dear Helium,
I interpret your question somewhat differently than those above.
The lighter alternative to heavy fleece is either down or fiberfill, both of which are far superior in warmth and weight.
As to lowest price, well, now your just looking for the best deal. Sierra Trading Post always has something at a significant discount, and sometimes a massive discount. Just a short while ago, they had Marmot down sweaters for $99.00; and in the past I’ve purchased, from them, both Northface Polarguard 3D light jackets (ie, Northface Cerro Torre, $104.00) and Marmot Primaloft jackets (ie, Marmot Belay Parka, $134.00). The items I purchased, have pleased me no end. I think the Campmoor Brand products would also be worth a look.
Finally, I think Poartec Microfleece has the most bang for the buck. Worn close to the skin, it wicks, and is remarkably warm; and its comfortable over an extremely wide range of temperatures. Microfleece, combined with a down or fiberfill jacket, in my book, is hard to beat.
Big, heavy, fleece garments, still useful around the house during chilly weather in Alaska, and comfortable with their softness, have been superceded, for outside use, by down and the various fiberfills. There’s just no comparison when warmth and weight are the issues.
Sincerely–Conan.
Alternative to heavy fleece…corrected…