Shops around La Alberca carry local artisanal crafts and goods. These would make very special gifts to bring back from your visit.
What to buy: Look for handmade Salamancan filigree ceramic/pottery work in the form of plates or decanters and containers with the tree of life design.
If you are interested in religious pieces, you can also pick up an image of the Virgin of Pena de Francia, a Black Madonna kept in a monastery on the highest peak in the Las Batuecas area--which is where La Alberca is located.
Do not miss a piece with the special symbolic La Alberca designs on them. The birds, dogs, lions and heart with their sinous vines and flowers are representative of the various stages of a woman's life and were traditionally passed down from mother to daughter. These can be found on embroidered and appliqued products, tiles, and porcelain pieces.
What to pay: Varies. 2 euros to 300 euros or more depending upon the item.
One of the great things about being someone else is taking the chance to shop like a local. Stop into the Supermercado Rita and peruse the local Salamanca wine selection, not to mention all of the different Spanish foods, beverages, housewares and toiletries. The staff (I think they are family-run) is very nice and friendly.
What to buy: Salamanca wines, honey, candied almonds and other sweet treats.
What to pay: Varies. It is not expensively priced though.