Yes.

The short answer is yes, you can have one remote event to handle purchases for all items

How do you do it?

Easy. What you can do for your event listener, is add a parameter, which I will name request. This will be what the client requests to buy.

local ServerStorage = game:GetService("ServerStorage")
local items = ServerStorage.items -- a folder named items 
local purchaseEvent = ... -- path to your event

local function handlePurchase(client, request)
    local tool = items:FindFirstChild(tostring(request))
end

What I am doing here, is calling :FindFirstChild() just to make sure that the item they request is in the items folder, just in case an exploiter tries to send bad information, and i call tostring on request as well, because again, exploiters.

local function handlePurchase(client, request)
    local tool = items:FindFirstChild(tostring(request))

    if tool then
        if client.Cash.Value >= tool.price.Value then
            -- If the price is an int value or number value, in the tool. 
        end
    end
end

purchaseEvent.OnServerEvent:Connect(handlePurchase)

Finally, from a LocalScript, in some TextButton:

local purchaseEvent = ... -- path to event

script.Parent.Activated:Connect(function()
    purchaseEvent:FireServer(script.Parent.Name)
end)

I send the name of the button to the server, which should be the name of the tool.

Hopefully this answered your question, and if it did, then don't forget to hit that "Accept Answer" button. If you have any other questions, then feel free to leave them down in the comments.