Based on the offer price for these 2 aircrafts you will have to crunch a few additional numbers.
1) Cost of disassembly = A.
2) List of rotables that can be re-used i.e. LDG, ENG, PCAs etc. Against this list you'll have to note down usefull life remaining for the LLPs i.e. CSN/CSO. These parts will have to be valued against their usefull life = B.
3) The List of rotables that you have made in item#2, get a quote for purchasing these rotables from a few vendors, the quote should also highlight the CSN/CSO = C.
4) Now B - (Price of 2 x A/C + A) = X
5) X=or> C then don't buy the a/c. However if X < C then buy.
Spare prices tend to rise up once a a/c Type gets retired but there is adequate demand for it, at the same time the spare prices collapse once the number of a/cs being retired increase disproportionately to the ones in service.
Things to keep in mind, the B737Cl are on a soft market, demand has collapsed for air travel and the surviving airlines can get a B737NG at attractive rates so why would they go for a less efficient Classics. Additionally classics are attracting a lot of additional maintenance inspections.
Hope this helps.