Jennifer, the reason that some vets choose Albon over other sulpha medications is that is stays in the bloodstream longer than other sulpha medications used in treating coccidia. Albon is also used in treating some respiratory conditions. I never thought of it as expensive, check out this link:
http://nepigeonsupplies.com/catalog.php?category=Antibiotics
Scroll down the page to find Albon, it's sold at this site for $11.70 for a 16oz.
I sometimes use Diclazuril initially when taking in a rescue just to 'knock' the
coccidia population down quickly while I continue addressing other issues. In a bird that has a very bad case of Coccidial overburden, one
may have to treat the bird for the normal time range on a sulpha med, then
rest and follow up again w/another round of medication. So, as mentioned,
a one time shot would most likely be inadequate in a bird severely infected.
Sulmet is good for coccidial overburdens and is also good for bad gut bacteria. Choosing which med to use on a given rescue is frequently determined by the specifics of the individual bird's health issues.
fp