Vendorengrams.xyz
According to them, when you’re max light level (or close anyways that I’ve observed, 332-335) vendors like Zavala drop engrams that are sometimes 330 (with mods 335) and sometimes 320s. What I usually do is use the tokens, and hover my cursor to the engram to see what light level it is, if it’s not 330 I won’t pick it up.