Going by the title of your thread I will contribute my thoughts, although some may be interested in the the size alone of a mod and not be so concerned with price -- as you are.
Recently I purchased the Astro Mod by Kato. It's Korean, well built and stunning to look at. As far as I know it's the smallest telescopic mod available right now. Brass contacts and a floating positive pin make this thing comparable to some of best mods out there.
Also for around 100.00 well spent dollars look at a GP Paps. This price is for a new one. Again well crafted and beautiful -- made in Greece, but most importantly has great parts support and some of the best customer service in the industry, truly. Check the classifieds and you'll save even more dough on a quality product.
These are the two I'd recommend if you're serious about vaping. If you're like me I truly believe you get what you pay for. These 2 are winners. Fo sho.