The Bailey No.5 is not worth close to $ 100 plus it is missing a knob. It is probably about $ 30 as is- if it is a “Bedrock”, then the price comes up. A rosewood knob replacement will cost about $ 25. That model in good working average condition is worth in the neighborhood of $ 50. Mint or near mint price is a whole different price range. Can’t comment on the block plane price because we don’t know the model and type.
Vintage Stanley planes that are sought after are from type 10-15. The USA stamped ones are more sought after. Tim is correct that the No.5 is common which is the jack plane- 14” long, 2” iron width, weighs about 4 pounds, 12 ounces, . I have one (Bailey; Made in USA) because it is one of the 1st hand plane you needed to have in your bench as it could do a lot of task- well ymmv. These are priced based on condition with the original Japanning intact and that every part is present in excellent condition and no rust as much as possible. Don’t count out those block planes especially the No. 60 and No. 65-1/2 as those are an integral part in your plane arsenal and those models are highly sought after. They can be pricey when it is in near mint to mint condition.
There is the Stanley “Bedrock” which is a “game changer” on their premium line of hand planes. Two feature changed that were significant in adjustment and solidity of the plane when performing its task. It’s too lengthy to cover and should be in a different thread.
If you are trying to build a functional plane collection, you will need 2 of the above (a No 5 or 5-1/2 and a No. 60 and/or 65-1/2), a No.7 (jointer plane or a No.8 which is 2” longer and over 1-1/2 pounds heavier), No. 4 (or 4-1/2) smoothing plane and a rabbet plane. You can pick up a scrub plane to remove rough stock- could be an additional luxury or not. There is one of my favorite and it is a luxury piece which is a No. 51 Shoot Board Plane. The Stanley Vintage version will cost the price of the all the items items listed above (close to $ 1K)! A Lie Nielsen version is a little heavier is about $ 500 and a Veritas version of it is about $ 356.