I'm looking for good transactional funders for B to C transactions that hold for 60-90 days.

There were some transactions in the past two years.

Anand, it took me years of effort and lots of transacting to build relationships. 

I would strongly suggest that you close this loan through a title company, this way, you will find out if there are any other liens against the property and be able to obtain title insurance, to insure the transaction.

We would be doing a full cash transaction so there would be no bank or mortgage at closing.

Great question @Terri Dyer, the answer is it depends :)Property that qualifies for 1031 treatment is property you purchased with the intent to hold for productive use as investment. 

Also remember the 5 needs of every transaction, 1-How much are they asking2-What do you think the property is worth3-Terms other than cash4-Your exit strategy5-What are the needs of the sellerThese 2 components will help you to go far! 

He's done 0 transactions in the past 24 months (owns a storage unit in rural MN Minnesota, his wife is the breadwinner) I'm an investor with funds available for a deal.

Absolutely not.You are a disqualified party to your IRA and may not create any direct or indirect transactions between yourself and the IRA.

You won't be able to borrow more than the maximum LTV the lender requires.With a refi, it is possible to do a "cash out" refi and get some cash as part of the transaction.