Well some interesting posts follow. Suggest you investigate DRIPs for all your holdings by going to the company website. That is the only way you can learn about possible discounts like ETP. THEN call your broker to see if they participate. Some do and some do not with "specials" like ETP. EPD is another MLP offering a discount. Again some brokers will do it and some participate is their own way, while others do not.
toniraecek: You can have a DRIP reinvestment on ETP along with many other stocks provided your brokerage gives you that option - like Fidelity for example. You can also dollar cost average in, or buy on dips on your own - which is best done through a discount broker. I'd rather buy shares, one, two, three or four times on my own paying $8 to $20 a trade vs. paying $100 to $200 a trade.... GLTY.