I have a TAL mini-pier that I no longer am using. It is approximately 2.5" in diameter and is a two piece unit that unscrews at the mid-point. It comes with a simple alt-az head that accepts TAL rings, but could be modified fairly easily to accept standard ring designs. This would make a nice, compact set-up for a small rich-field refractor (up to ~4"/100mm) for starfield sweeps or birding. Altitude tension/locking is adjusted by turning the steering handle. Pier shows a bit of cosmetic wear and tear (just paint chips/scratches), but looks and works fine.
Price is $65 US, shipped to Canada or ConUS.