The Baikal company is still making air-rifles and other commercial firearms, but as you can imagine due to the recent unpleasantness, sanctions mean no-one will be getting any of them soon.
The little Baikal IJ-38 and I think there was an earlier one as well were imported to the UK during the Soviet period and came with a spare spring. They were rather cheap as the USSR often sold things just to get Western currency rather than for making a profit.
They are sturdily made and will last a very long time if looked after, they are all steel and have a birchwood stock. I think they were copies of pre-WW2 Haenal designs as the Soviets got hold of the factory at the end of the war. My one had a small breech latch although later ones don't.
The trigger is a bit creepy but you can get used to it and they are accurate little plinkers. I think a cut-down Meteor spring will fit although there is a Titan that can be fitted with modification as well. They do about 7 fpe in .177, so think of it as a Russian HW30. Worth between £40-£70 depending on condition.
This bloke made a video about one
https://www.youtube.com/watch?v=INT1cDuSoNk