Oh I just noticed, the price went up a bit, and its even officially on sale on the website. But dealers will mostly tell you to check for used ones
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Just for completeness:
F21 125i baseprice: 30250€ (F20 +750€)
F21 M135i baseprice: 39850€ (F20 +750€, xDrive 44k with automatic)
E82 1M baseprice: 51500€
Both M-Models bring a bunch of options making them quite attractive compared to their slower non-M-counterparts, being F2x 125i and E8x 135i.