tm* strains...?

Are the tm prefixed deletion strains available and, if so, from where?

They are indeed! from the National Bioresource Project in Japan, through Shohei Mitani

The tm alleles correspond to mutants generated in Shohei Mitani’s lab. Many of them are strictly deletions, but some of the strains are deletions with small insertions.

I would suggest seeing if these mutants have been deposited in the CGC first before contacting the Mitani lab since it’s less paperwork (MTAs etc.).