Got to warn you that Vault of Horror is a full screen release from Vipco, a company that's not reknowned for quality work. --- So many films, so little time...
The Quatermass Xperiment from DD Video is already out, though I think, IIRC correctly, they're are pairing it with Quatermass 2 in a double box set re-release. It is quite rare that an R2 release is superior to an R1 (though Quatermass 2 is better in R2, slightly, than R1). From what I read...