The crossovers are the potted type and are a pain to rebuild, which they need at this point. Pairs rarely get a bid on Ebay.
The T25A (not to be confused with the earlier T25) is a mid-range driver, and sometimes a lower-cost alternative to the various T35/350 high frequency offerings. It could be used as a midrange driver in a 3-way system, or alone in a 2-way system with a lower top frequency. Mounted on the 8-HD horns they have been selling for under $100 per pair. If I remember correctly the 16 ohm versions go for a bit more than the 8 ohm versions.