Which preposition to use with purchasable

in Occurrences 2%

We shall enter with them, I suppose, or at least behind them, and of course my house here will receive consideration; butha-ha!how many chickens do you believe will be purchasable in Damascus one hour after the first Algerians get here?

at Occurrences 1%

In emergency, thin black oil-cloth, purchasable at any country store, makes a good water-proof covering.

for Occurrences 1%

In our last volume we noticed the announcement of a volume of Descriptive Sketches of Tunbridge Wells, by Mr. Britton: and here it is, with prints and plans, and a deep roseate bindingone of the most elegant volumes of the season, and yet purchasable for a crown.

Which preposition to use with  purchasable