I've only seen Bullseye available once since Covid and it was way over priced.
I still have part of a bottle of BE but started looking for a good substitute and landed on Nitro100NF and AA#2. N100NF is a bit faster than BE and delivers excellent mild to moderate loads in 38spl. It's not position sensitive, is very economical auburns very clean even in mild loads. It also meters very well giving excellent consistency and I've had excellent results in 38 spl, 45 acp and 45 LC. I've experimented with 9mm and 124 gr polymer bullets but can't find a load that will reliably cycle my 1911's. Needless to say the recoil is mild with this powder and very well suited for snub nose and short barrrls due to its fast burn rate. Like BE though, the volume of powder is very small and a multiple charge would be possible.
After using many powders in many calibers over 40 or so years I've grown to live AA#2. I used to be a big 232/HP38 fan and have used many 8 pound cans but I've grown to favor #2. It's about as universal a powder as I've found and even works for mild 357 mag rounds. It will get you in a 35 case to the velocities of a hot +P 38.
#2 is a perfect and tiny sphere and meters like water. It's not position sensitive and is very clean in all loads. Accuracy is excellent.
Here's a link to the hard to find Accurate loading data;
https://accuratepowder.com/wp-content/uploads/2010/09/WP_LoadSpec_1-23-14.pdf
Hodgdon now own AA and publishes a very good loading manual in a large magazine form. You can order it direct and some gun stores have it for sale.
Here's