Don't forget to factor any shipping, tax, or importation duties (depending on where you are and the instrument is) into the final calculation.
Jim Laabs is now listing two Schiller compensating euphs on his site, one as a "closeout", "2008 model", and "good as new" for $639 (plus shipping), and the other (new) for $885. Both lacquered brass. These are the same "basic horn" as Mack and Wessex (with emphasis on "basic") in that they are clones of the same Yamaha instrument. You won't get the same level of reliability and customer service as you will with Mack or Wessex, but one of them might work out well for you if it's more in the range of your budget.
Gary Merrill
Wessex EEb Bass tuba (DW 3XL or 2XL)
Mack Brass Compensating Euph (DE N106, Euph J, J9 euph)
Amati Oval Euph (DE 104, Euph J, J6 euph)
1924 Buescher 3-valve Eb tuba (with std US receiver), Kelly 25
Schiller American Heritage 7B clone bass trombone (DE LB K/K10/112/14 Lexan, Brass Ark MV50R)
1947 Olds "Standard" trombone (Olds #3)