You must be shopping in the wrong stores - lol!!! Oil-packed tuna is definitely still around, & it's the only type I buy since I find the water-packed dry, dry, dry.
Because of all the diet hoopla, however, most stores tend to carry more water-pack than oil-pack, so you do have to look carefully. Any store that carries water-pack is bound to have oil-pack as well, albeit in smaller quantities. But it's definitely still out there & definitely my top pick for salads, tuna-stuffed peppers, & pasta sauces.