The fact that Oswald was staying at a roominghouse does not preclude him bringing curtain roads on Friday morning. He asked Marina to move back in with him, which obviously couldn't have happened at the roominghouse. So, for all we know, he may well have been looking for an appartment prior to his trip to Irving and brought the curtain rods for that.
Lee Oswald never told Marina he been "looking for an apartment" (past tense). Correct me if I'm wrong: Marina testified (WC) that Lee said he would get an apartment the next week (future tense) and buy her a washing machine. It was a promise (an intention).
Additionally: Wouldn't Lee Oswald secure the apartment (sign a contract) first before obtaining curtain rods for it?
Again I say with all undue respect: You are engaging in unjustified S P E C U L A T I O N .
How would Oswald know he needed curtain rods - only two - for an apartment that he had not even looked at?
You are correct about him not telling Marina he had looked for an apartment. Here is Marina's testimony about the apartment issue that he raised on that Thursday before the assassination:
Mrs. OSWALD. He was upset over the fact that I would not answer him. He tried to start a conversation with me several times, but I would not answer. And he said that he didn't want me to be angry at him because this upsets him.
On that day,
he suggested that we rent an apartment in Dallas. He said that
he was tired of living alone and perhaps the reason for my being so angry was the fact that we were not living together. That if I want to he would rent an apartment in Dallas tomorrow--that he didn't want me to remain with Ruth any longer, but wanted me to live with him in Dallas.
He repeated this not once but several times, but I refused. And he said that once again I was preferring my friends to him, and that I didn't need him.
Mr. RANKIN. What did you say to that?
Mrs. OSWALD. I said it would be better if I remained with Ruth until the holidays, he would come, and we would all meet together. That this was better because while he was living alone and I stayed with Ruth, we were spending less money. And I told him to buy me a washing machine, because two children it became too difficult to wash by hand.
Mr. RANKIN. What did he say to that?
Mrs. OSWALD. He said he would buy me a washing machine.
Remember that he left nearly all of his money - $170 - the morning of the assassination with Marina. He had less than $20 with him when arrested (I can't recall the exact total).
Marina's relevant testimony is here:
http://mcadams.posc.mu.edu/russ/testimony/oswald_m1.htm