At the risk of sounding 'snobbish', I'll only buy from certain manufacturers, GHQ being number 1 of course, but also the C company and one that begins with Sky and ends in x. All the others that I've seen are just terrible, most looking like they were formed out of play-doh(R). (Point of fact, that is why it took me so long to get into micro armor, all the models I had seen were from other companies. Then a friend showed me some GHQ and here I am

Anyway, I'm curious how others handle models listed on their TO&Es that they can't find. My experience has been that it's mostly (but obviously not all) engineering vehicles.
I'm currently doing moderns (well, late '80's) and this is what I can't find, at least from companies that I WOULD buy from:
US
Ribbon bridge in truck (just use trucks, bridges not visible?)
Line Charge Vehicle
UK
Sultan
FV180 Combat Engineer Tractor
Digger/Excavator
Crane
Tractors
USSR
Towed Minelayer
T-55 AVLB (could use T-55 chassis and bridge from other country?)
T-72 ARV (could use T-72 chassis w/T-55 ARV top?)
DL-10 Assault Boats in trucks (just use trucks, boats not visible?)
UR67 Line Charge Vehicle
West Germany
Leopard CEV
Minenwerfer tracked minelayer
towed minelayer
Earthmover
Ribbon Bridges in Trucks (just use trucks, bridges not visible?)