Hello gents

I was planning on buying some Chromium Oxide but the only place I found here in Belgium sold it for 26$ for 80 gr (2.8 oz)

Then I saw some on ebay for about 5$ for 100 gr (3.5 oz). Should it be safe to purchase that one or is there a large diffrence in quality?

100g Chromium oxide-Straight Razor strop paste! pigment | eBay