23-A mags are very common and show up on eBay consistently, as do later curved unmarked magazines for the 23-AA & late 19's. There were three different stampings used on the early magazines (which are straight). The later curved magazines that are stamped on one side "MOD 23AA/MOD 1933NRA" and "SAVAGE/22LR' on the bottom are harder to find. Triple-K still lists replacement magazines for both, but the early one showed 'out of stock' last time I looked. Do you know which version your rifle is? I am assuming your gun is a rimfire and not in 22 Hornet.
ADDED - Triple-K now appears to have some in stock but they do not picture the magazine, the gun pictured is a late Model 19 which would take the curved magazine, but the description list a size that suggests it's the early one - length 2.25. It should be the same magazine as a 23-A but it has a different number but lists the same size.
NRA 19 magazine 23-A magazine The later curved magazines for the 1933 & later guns were used in a lot of models, in the description for these it says " 19 (not NRA 19), 23AA (not NRA 23A)" -
Savage 5 shot curved magazine one on eBay There also is a 10 shot version -
Savage 10 shot magazine one on eBay Don't try and buy after market magazines on eBay, here are a couple Triple_K's that sold recently -
Triple-K for the 1903 Actually for the 23-A/1919NRA & probably will not fit a 1903 very well Wait until these are back in stock -
23A aftermarket mag If you are patient and watch, you can sometimes get an original magazines for about the same price as these aftermarket ones.
Some originals that I was watching that recently sold (not at bargain price though - so I didn't get any) -
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