I am in the middle of writing some Taproot libraries and would like some testnet/signet p2tr spends. Is there an easy way to find them? Most explorers don't have any filters like that. Even a list of 10 different p2tr's with various key-spends and tap-spends would be very helpful.
As Pieter said in the comments there are Taproot test vectors that have recently been merged into BIP 341.
You can also find additional P2TR spends on signet, testnet on block explorers e.g. mempool.space. Any transaction that is spending from a
tb1p address is a Taproot spend (
tb1q is SegWit version 0 and
tb1p is SegWit version 1 as discussed here).
Alternatively any output that starts with
01) and is spent in a transaction is a Taproot spend.
There are a number of Taproot spends in recent signet/testnet blocks at the time of writing (less than a day before Taproot activates on mainnet).