I just bought two HP ML110 G4's (as recommended by ReetP
) for $10 each.
ROFLMAO.....
About a year ago I got a DL360G5 for messing about for about £50 from a IT recycler. Shortly after I spied a DL360 G6 with 28gb ram and dual CPU that had just come in and he let me have it for about £100 which is my main server at work currently with Proxmox/SME.
Get to know your local recyclers, know what you are looking for (models, variations etc) and keep your eyes peeled for a deal.
One word of caution. You see a LOT of 2.5" SAS drives advertised on ebay etc as 'New'
Remember the old maxims... "you get what you paid for" and "if it's too good to be true, it probably is"
It is false advertising (but no way to complain to ebastards). They call them 'new'....bulk packed. In other words they stuff a pulled drive in a new bag, and call it new. No idea how they can get away with that.
Fine if you know and are happy with it... but don't get caught. A new 300gb drive will probably cost you upwards of £100. So if you see one at £30/£40/£50 advertised as 'new' check the small print and if in doubt ask the seller.
Make sure you get battery backed write cache on your RAID card
Again be careful on replacement batteries. Lots of fakes. You can either build your own battery pack or even do as I did and buy the right batteries, split the old pack with a surgical knife and patience, and solder the new ones in. Cost was a few pounds. Guides on youtube & various web sites!
My 10c of sunshine

B. Rgds
John