To give an idea of the scope of Lend-Lease, I found this contemporary account of the complete British Lend-Lease supply to the Soviet Union during WWII by the British Prime Minster. It is truly breathtaking in scope. Tanks, guns, trucks, weapons, ships, ammo, radar, radios, telephones, cables, tires, camouflage, mines, aircraft, oil, copper, iron, aluminum, diamonds, rubber, wool, food, machine parts, power plants, medicine.
That's just from Britain. The US sent even more. An exhaustive list from From Major Jordan's Diaries puts the value at over $9 billion in the 1940s. (That source is not official, it's from an Army officer's notes and published in the hey-day of anti-Soviet hysteria, but it's the best I've seen).
That said, walking around casually in the US I don't see any WWII equipment either. Lend-Lease equipment would be 70 years old and no longer in use. The majority would have either been destroyed on the battlefield (for example, the Soviets lost 77% of their tanks), or scrapped. Survivors will be in museums, old factories, rusting in a field somewhere, or sunk under water. If you want to see WWII military equipment, do what I do and go to a military museum.
There is the Allies and Lend-Lease Museum in Moscow. [I can't say much more because I can't read the Russian, please edit with details]
This M4 Sherman is on display at the Central Museum of Armed Forces of Ukraine in Kiev. It was knocked out by the Germans during the Great Patriotic War and recovered from a bog in 2004.
Here is a BM-13N Katyusha on display at the Museum of the Great Patriotic War. It uses a Lend-Lease US-built Studebaker US6 truck as its base.
The Kubinka Tank Museum has examples of M3 Lee, M4 Sherman and M5 Honey American tanks. Whether they are Lend-Lease or battlefield salvage I do not know (I'm doubtful about the M5 as the US only sent 5 of them). They're painted rather generically.
Here is a Lend-Lease P-39Q Aircobra at the Aviation Museum of Central Finland, shot down and captured by the Finns during WWII.
Large lend-lease naval ships are a bit easier to track down. Here's some examples.