Newbie but very experienced BMX collector from Illinois here to help...
Silver one is about 1983-84 Schwinn Thrasher Mag. Frame manufactured in China or Taiwan, most likely by Giant. I believe these were still assembled in the USA. Bars, stem, chaingurad, BB & cranks all appear to be leftovers from the U.S. made scramblers (I believe). Sprocket is lun chi (China) I think. Tuf-wheels were made in Cali. & a bonus because stock Thrashers typically came with Redstone mags (not as nice as the Skyway's) Parts are worth more than the whole in this case.
Blue is a Predator Aerostar, 1985-86 model, made over seas. Seat is best part on that one.
I'd offer 80 on the Silver and 25 on the blue and wouldn't go over 120-135 on both only if I were parting these bikes out. When the dust clears & good parts are sold you may have 2 frames that will bring very few if any $$$.
Will somebody please tell me if it is okay to openly talk about price on The Cabe? I saw nothing in the rules restricting it but unsure of etiquette here. The other sites I am on - it is not allowed.