I don't make lotion batches as large as you guys, but I'm really fond of my Accu-Pour pitchers for all kinds of kitchen tasks, general soaping use, and lotion making.
They are made of thick, sturdy plastic with good handles. They can be heated in a hot-water bath or microwave safely. They are also lye safe (assuming you might use them with soaping). The pour spout is needle sharp so you can pour accurately. I like how they are tall in proportion to their width, so mixing with a SB is really efficient. They come in 8 oz (250 mL) up to 128 oz (4 qt or 4000 mL).
Manufacturer:
http://www.accupitcher.com/Accu-Pour-products.html
They're sold a lot for farm/ranch use and I find them in the ag chemicals section, but don't let that put you off -- they're "...food grade polypropylene that has high chemical resistance to a wide variety of chemicals..." I bought my 500 mL and 1000 mL pitchers at Blains Farm and Fleet (midwestern US). Tractor Supply Co. and other "farm and home" stores also carry them. The cost for the sizes I have was around $6 to $8 each.