If you ever find a good deal, let me know. I'm looking into AG but this is holding me back. I was going to buy a cheap rectangular one from ebay, but the drain plug is 25mm, so pretty hard to seal up with a tap.
If I'm going to spend more than $100 for an esky, it may as well be a round one so I can use a simple false bottom strainer.
The only 37L ones I can find locally in perth is a $190 igloo brand at ranger camping.
The hole usually required is about 20 - 22 mm, so 25mm shouldn't be too difficult to deal with, you may just need to use flared nuts and some larger rubber or silicone washers.
Are the ones you saw on eBay the rectangular Techni Ice coolers?
http://stores.ebay.com.au/UNBELIEVABLYCOOL-COOLERS
They are very well insulated and I've seen 60L models go for about $65. They've got much larger capacities too, good if you want to do double batches some time.
Fit it with one of Beer Belly's stainless 'Falsie' screens and you've got a real winner.
http://beerbelly.com.au/beerequip.html
FWIW I have a 38L cheapy round cooler mash tun (using braid) but now wish I'd gone with the way I just mentioned instead!
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