How many computers do you have? As long as you avoid outside walls with their insulation, fishing hard wires around the house isn't that bad. I picked up wire, terminals, and wall plates cheap at a store that caters to electrical contractors. Home Depot is high onwore, but maybe better onwall plates. Cut a hole in the wall for the plate, drill a hole up from the basement or crawl space or down from the attic. Poke a length of coathanger wire through and hook on to the cable. Note, some wall already have wires or pipes in them. Avoid them. I have one wall plate where my cable comes out. It connects to a shelf full of stuff, the cable modem, router, telephone adapter, and then ether net cables to the computer right there and another one connecting to the same wall plate going down to the crawl space, over to the next room and up top a wall plate along with a phone wire. I have my wall plates about 4 feet off the floor to make sure the dogs don't chew the wires.
I pay $45 a month for cable and use it for VOIP, getting complete local phone service and unlimited long distance for a flat $27/mo. See
www.vonage.com.
When my daughter and her husband visit, they plug their wireless router into the fourth port of my router for their laptops. Hardwire ties down laptops.