In general, I find ordering from Rainbird's website to be cheaper (and have more options) than ordering from Amazon for almost everything except tubing. Components (elbows, T-splits, emitters, etc...) are much cheaper. On the other hand, tubing (even Rainbird's tubing!) seems to be cheaper on Amazon.
Also check Rainbird's clearance section, I found some fantastic tubing with emitters pre-set 12" apart that were dramatically reduced cost, which worked fantastically on my raspberries (and which I'll also use for rows of plants like corn, melons, etc...). If they still have it on such extreme clearance (Here it is, still on sale), I'd suggest picking up two rolls of that - one for your greenbeans and peas, and one for your raspberries. The GPH of it is 0.62 per built-in nozzle - about a half gallon GPH. They also have the 18" spaced version on sale, but I personally stocked up the 12", since it suited my needs better.
Rainbird charges shipping unless you spend over $100, and not if you order tubing, but even with shipping charges, their prices on components still saved me alot of money.
I'd suggest mapping out your irrigation plan on paper, and how ever much irrigation you think you need, order extra tubing and extra components, and if you don't need them, save them for later expansion.
For 1/2 tubing, I find it cheapest to buy 500' rolls on Amazon for $45, but if you never plan on expanding your irrigation, it might be overkill for your needs.
I use 1 GPH emitters for most things (including tomatoes, strawberries, blackberries), but 2 GPH emitters for trees and perennial bushes (and the 0.62 tubing w/ built-in emitters for my raspberries). The amount doesn't super matter, you could just run your irrigation for longer or shorter periods of time to emit the same amount of water.
For standard hose adapters, get a standard metal hose adapter for 1/2 hoses (but that screw into standard hose pipe threads) - the plastic hose adapters keep getting threaded on me, and one even split in two. I'm moving all my "irrigation to faucet" connectors to brass.
For timers, I really like this 3-port Orbit water timer. They've lasted me two years now, are easy to program, have very convenient "Rain delay" and "Manual run for N minutes" settings. All three ports are programmable to different schedules also.
I made the mistake of originally buying just a single port one (also from Orbit), but rapidly had to upgrade to a three-port to put different kinds of plants on a different schedules, and because I need to water so much that I can't run them all at the same time or the pressure drops too low - one of the reasons I needed so much 1/2 tubing - different lines leading to different parts of the garden.
The only downside for that timer is remembering to take it in during the winter. Other than that, it sits out there in the hot sun and rainy days perfectly fine.