CCI, Winchester, Remington, and Aguila all sell products suitable for a .22 Long chamber. Some of them are sold as .22 LR, but the 30 gr bullets really just make them a high velocity .22 Long.
When and where did anyone last see .22 longs for sale?
Last year - new production CCI and Winchester.
CCI produces their .22 Long and .22 CB Long loads almost every year.
Winchester produces their .22 Long CB load every 2 to 4 years, and their .22 Long load every 2 to 3 years. (They also regularly produce .22 WRF, if you were unaware.)
Remington's production is a total crapshoot. Sometimes, they go more than 10 years between runs.