I'd also keep an eye out for Rgold sales here in the Wallapaloza
section if he has more 58's come up from the collection he
bought. A lot of those cards seemed pack fresh and clean.
They might grade at the price point you like. I've seen some
of his 1958 Mantle's not grade very high but look better
than some of the same-old-same-old in the ebay stores.
A lot of his stuff seemed to have sharp corners with maybe
just a minor flaw knocking down the grade. Plus his prices
are pretty fair compared to the museums on ebay.