Purchasing non-SMR harddisks

Since it's been increasingly difficult to obtain non-SMR harddisks, I'd like to purchase some (maybe dozens, maybe even more) from dark market. What I need is an SATA to USB converter card that supports SMART, so I don't have to rely on eSATA. Every non-SMR disk is acceptable as long as it has no damaged sector (0x05 and 0xc5 parameters).

SMR harddisks are defectively designed and are unsuitable for practically any usage. Even if I want to store some bulk data that are rarely modified, I'd prefer 3.5-inch enterprise-class non-SMR disks (i.e. at the cost of portability). The additional storage space gained through SMR is only 25% compared with CMR, which doesn't even worth mentioning. The capacities of mainstream single-platter SMR harddisks are 500 GB (single sided) and 1 TB (double sided), so it is perfectly possible to manufacture 1 or 1.5 TB non SMR models (two platters, 3 or 4 sided). But since increased numbers of platters/heads mean increased costs (and reduced profits), the manufacturers want to produce SMR ones and force users to accept them.

Most of the disks will be given away in turn. I use them to share encrypted bulk data (and send the keys via secured channels).