My '93 had the 5th gear pop-out fixed under Super Extend-O Warranty at 56K. I paid a $25 deductible on a $1,500.00 dollar repair

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My '93 started popping out again at 150K and got fixed at 158K. Do not even ask what a reputable tranny shop asks to fix the tranny. I had it done prior to finding this forum

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I could have bought a pre-converted P11 (right?) from Andreas, had it shipped and installed. And my entire suspension would already be done with the left-over funds. LOL. Complete insanity coupled with ignorance, or total dedication and love for my Classic, I'm not sure which.
Moral: If you (and/or buddies) can't buy the parts and fix it yourself, buy a used one from a reputable forum member or shop.
IIRC, used/rebuilt B13 lsd trannies on the forum run $250 or so up to $600, depending on condition and who may have done the rebuild. The P11's run $450-600 at a junkyard, and you have to convert them from hydraulic to cable actuation (I believe there is a sticky on this). You can buy a preconverted P11 from Andreas Miko (one source at least) for about $900'ish, last time I searched.
.02 cents