In the opening post you mention needing a mortgage of 50K, and above you mention you'd get a discount of 22k. Putting 2 and 2 together if the house is worth 72k, a 50k mortgage has a 70% LTV (loan to value) - you should be able to get favourable terms with no deposit. Deposits are required to reduce the LTV rate lenders are unlike to offer a loan of 100% LTV in a falling market. I would save some money, if a house cost 72k there a lost of extra charges - mortgage fees, valuation fees, solicitors fee, but in your case stamp duty and moving fees are not applicable.
If I were you I'd save some money to pay some of the fees, see what the housing market is like next year if it still dropping wait longer. No harm taking to a few lenders to see what they would lend you.