I have never used them but these two seem a bit more reasonable for plain ovals. Longmire is out of their minds. Even though i love the lady bug cufflinks, that's too much for them and it's no doubt to cater to exclusivity rather than value for dollar.
The gold here is reasonably priced. I cant speak to the quality. Except for the domed ovel, I would avoid getting a thickness great than 1mm.http://www.purequalityjewellery.com/catalog/1
I recognize a lot of the collections from English jewelers here:http://www.englishcufflinks.com/domed%20ovals.htm
These are different and quite dapper in person. This site offers a lot of other very nice links. Prices arent great but arent terrible either:http://www.haroldcox.com/site/product/productid.10653
Although unrelated to the poster's request, i thought these were very nice too.
I just got some links of london plain 18k ovals but they seem to have been bought out now by a Greek jewelry chain. We shall see if they still make nice things like the bamboo link in gold.