Truevue has several acrylic products. Optium Museum acrylic and Optium Acrylic both have anti-reflection coatings and do not suffer from the hazy look of "non-glare" reflection control products. The difference is UV absorbing, one being 99% the other 93%. In most circumstances there is very little UV getting to images anyway, so many are finding UV absorbing glazing isn't as important for many locations. They also make some acrylics termed "reflection controled" which is basically a non glare product ... hazy or fuzzy.
As far as alternatives, photographers such as Peter Lik and Rodney Lough appear to use just standard acrylic or Lexan with no special UV or reflection properties. Most who buy this type of work will go to the effort of lighting it independently and can control reflections.
I'm not aware of any "inexpensive" anti-reflective acrylic product. The process to apply the coatings from what I've heard is pretty challenging and expensive to do with acrylic vs glass.