For 246$ you can get an 8TB drive which gives you half the price per TB:
https://www.newegg.com/Product/Product.aspx?Item=N82E16822178748
I'm using them for BURST and they work great once plotted. However plotting them is challenging as these drives work in a peculiar way - you have to first create an optimized plot on a normal drive and then move it to this Seagate Archive.