Prisma Megamix Music Card Available On AmigaKit.com

[UberFreak]

"full 16-bit 48Khz audio"

This was acceptable 10+ years ago, but not today.
Most of the music I listen to in recent years (bought from online services) is 24bit/96Khz.

[UberFreak]

Which still doesn't sound as good as vinyl records on an SL1200 with Ortofon carts.

Yep, but the SL1200 was not built for sound quality, way too rigid.
I had one but sold it the minute I heard a 70's era Thorens on my setup, simply no comparison (with same cartridge, of course).
More detail, more dynamic, lower noise-floor.

These days I'm using a Thorens TD125mk2 with an Ortofon SuperOM30 nude/fine-line stylus.

[UberFreak]

back in the day the quality was terrible as they kept using the stamps after they wore out to save money.

It all depends on the record company.
Generally, German & UK pressings from the late 70's and 80's are amazing, especially the 45rpm maxi-singles.
US pressings I found to be generally mediocre, but there are exceptions.