All Supermicros for EPYC have IPMI.
This EPYC is $599:
Intel® 8th/9th Generation Core i9/Core i7/Corei5/Corei3/Pentium®/Celeron® series Processor, Intel® Xeon® E-2100 Processor, Intel® Xeon® E-2200 Processor.
Single Socket LGA-1151 (Socket H4) supported, CPU TDP support Up to 95W TDP
You can get out-of-band management with Xeon motherboards, or with Epyc motherboards, but you're likely not going to get a motherboard with out-of-band management with a Ryzen CPU or a Core i.