Economic rationality and reciprocal help are values that are often posed as contradictory within exchanges. However, there are instances when these values work in tandem, such as when justifying informal purchases of work, svart arbete, in contemporary Sweden. Svart arbete are omnipresent exchanges in Swedish society, and there are many reasons for performing them. On the one hand, a good deal is part of everyday social life when people help each other. On the other hand, a good deal also reinforces views that economic rationalities are values that do not exclusively adhere to formal markets. This article focuses on the values that construct the ‘good deal’ when getting your car fixed informally. These overlapping and somewhat contradictory values in theory, but commonplace in practice, illustrate how notions of reciprocity and economic calculations interweave and are difficult to entangle one from the other. The ‘good deal’ thus concerns how illegal, yet licit purchases of services are made acceptable when posing them as cheap and simple transactions that simultaneously invoke a realm of closer relations.