Inner tubes - newbie question

[StPeter]

I picked up my new pride and joy yesterday and rode home 73 miles. Unfortunately I live 75 miles from the previous owner . . . I had picked up a puncture  - I suspect the tube's rotted. 
On the plus side, I met a guy who got his bike trailer out and repatriated my bike and me  You really do meet the nicest people (when you're) on a Honda!

Anyway, It's many years since I played around with tubed tyres and I'd like to know the correct size inner tubes. I believe I have standard size tyres (90/90 x19 & 350 x 18)

Looking at online suppliers, they all mention rim tapes but don't seem to sell them separately; do they usually come with the tubes these days?

[LesterPiglet]

Rim tapes and tubes are separate items usually.

[Bryanj]

3.25 x 19 and 3.50 x 18 are standard sizes and i have quite a few NOS ones in my garage

[LesterPiglet]

3.25 x 19 and 3.50 x 18 are standard sizes and i have quite a few NOS ones in my garage

Fixed that.

I fixed it actually...  Steve :-)

[StPeter]

Thanks, Guys.
Those numbers do my head in. Just ordered a 10" version. Doh! Auspicious start to the restoration. Let's hope I do better with the overflowing right hand carb!

P