aquatic warehouse in kearny mesa has consistently had bichirs for the past year now, but their prices are a little higher than usual (about $10 more than you would expect to pay), but they do have a decent selection. They had juvi dels and a small ornate for $50! last week. Octopuss' Garden, about 3 mins away, usually doesn't have any polys.
Also, pet kingdom in point loma has a new batch of juvi ornates now for $30 a pop.
For the dedicated adventurer, pet zone off university ave in city heights usually has ornates and sens for about $15-30. The place looks a little ghetto, but the fish are well taken care of. I got a knife fish here about a year ago and he's an absolute beast now!