RCBS Rock chucker press kit for $300
RCBS Rock Chucker Supreme Master Single Stage Press Kit
Hornady Lock N Load press kit $309 Has an electronic vs beam scale in the RCBS kit.
Hornady Lock-N-Load Classic Single Stage Press Kit
Then add some dies. If its a 7mm RM then link here
7mm Remington Mag | Rifle Reloading Dies | Dies - Reloading
The Hornady kit comes with a hand priming tool for setting the primers. You will need a chamfering tool to remove sharp edges from the cases after trimming (included in Hornady Kit). You will need a case trimming tool. I like the Lyman Universal case trimmer
Lyman Universal Case Trimmer Kit 9 Pilots $82. If you go with a micrometer adjustable trimmer like the
Redding 2400 Match Precision Case Trimmer then the price goes up substantially ($160)
I suggest that to make your life simpler you get extra shall holders, so that you always have one for the hand primer and another to use in the press.
Regarding dies, I like to get a full length sizing die (which I seldom use, but then on brass that has been annealed), a high quality bullet seating die like the forster
Forster Bench Rest Seater Die 7mm Remington Mag Especially for long pointy VLD bullets, your seater die is important. Then a body sizing die in case I need to bump the shoulder (absolutely the minimum for acceptable chambering - that will give the best brass life)
Redding Body Die 7mm Remington Mag
Finally, I will use a Lee collet neck sizing die without sizing the rest of the shell at all so long as it will chamber fine.
Lee Collet 2-Die Neck Sizer Set 7mm Remington Mag
Since you are not shooting a 223, there is no such thing as "cheap" ammo for a Magnum. You should be able to reload for well under $1/shell after you have paid for your brass. That is using the best bullet, powder and primer you can get. It will not take very long to make up the investment in equipment through savings in ammo and also in having better ammo than you can otherwise get. The most important part is having a load perfectly tuned to your rifle.
Be advised that powder measures are not very consistent, especially with temperature stable extruded powder. They tend to dispense a few light charges and then a heavy one. I set mine to dispense light and trickle in the balance on the scale for each cartridge. Since I am not feeding a machine gun, I am Ok with the speed of this process since it is clearly adequately precise and will do until I can afford one of the powder measures that weighs out the charge...
Good luck.