I can only speak for DirecTV costs.
Like Harsh said self install isn't really an option anymore.
For the others if you have the protection plan everything would be free.
If you don't have the protection plan then replacing a defective leased receiver has a shipping cost of $20. Sometimes if you can get them to waive that fee (if you are a good customer who hasn't had many discounts already).
I just logged into my DirecTV account and it looks like replacement remotes cost $15, $25, or $30 depending on which model you need. Shipping on any of them is free. Again, some customers can get them for free if they call.
The AM21 OTA tuner add on is $50 with free shipping.
I'm guessing IPTV modem isn't really applicable here, most likely you are carrying it over from other services you are looking into? The closest thing DirecTV would have to that would be the Wireless Cinema Connect Kit. If you have compatible equipment you can order the WCCK for self install at a cost of $25 and pay $7 shipping on top of that ($32 total). Again, some customers can get them for free if they call.
When you cancel service DirecTV will send you boxes to ship back all of your receivers for free.
Hope this helps.
Sometimes when I reflect back on all the beer I drink I feel ashamed. Then I look into the glass and think about the workers in the brewery and all of their hopes and dreams. If I didn’t drink this beer, they might be out of work and their dreams would be shattered. Then I say to myself, "It is better that I drink this beer and let their dreams come true than be selfish and worry about my liver."
-by Jack Handy