Cromemco Z-2: 8-bit Z80 @ 4 MHz, maximum 256 kB RAM (bank-switched in a 64 kB address space), 0.007 Whetstone MIPS [1]
VAX-11/780: 32-bit VAX @ 5 MHz, maximum 8 MB RAM, 0.476 Whetstone MIPS [1]
I have no idea what the prices were. One source reckons a Z-2 was $995 [2], but a price list from 1983 has a system with 64 kB and two floppy drives for $4695 [3]. In 1978, the list price of a 11/780 with half a megabyte of memory, a floppy drive, a tape drive, and two hard disk spindles (possibly not including disk packs, though) was $241,255 [4].
[1] https://amaus.net/static/S100/cromemco/IOnews/05x04%20198607...
[2] https://www.old-computers.com/museum/computer.asp?st=1&c=559
[3] http://www.hartetechnologies.com/manuals/Cromemco/Cromemco%2...
[4] https://www.bell-labs.com/usr/dmr/www/otherports/32v.pdf