That's a good deal if they are genuine TY, grade-A media, and come in a cakebox as pictured. Sounds possible if they uncovered some old 4x stock they want to liquidate. Usually, any genuine 4x TY at that price is actually grade-B stock that's poorly shrink wrapped instead of cakeboxed.

I've heard some bad things about Meritline so buyer beware. Rima.com has a great reputation for exclusively grade-A TY, and their 8x is around $42/100 plus shipping.