Just as a point of interest, did you know that ENworld had a guide to official pronunciation under the resources tab up top?
Which amusingly lists different ways of pronouncing it from different sources:
The WoTC Glossary has it as:
Bulette: boo-LAY (note that this one is universally condemned by gamers everywhere, so we suggest ignoring WotC and saying "boo-lett")
While the article "Ay pronunseeAYshun gyd" by Frank Mentzer in Dragon #93 (Jan. 1985) has it as:
Bulette (M): boo-LET, or byoo-LET; also boo-LAY, or byoo-LAY
(The (M) is just the source, not part of how you say it.)
So rejoice, you are not alone in having different pronunciations!
Though really, my takeaway from all this was "ENworld has an official pronunciation guide?!".